A high wind speed vertical fan

Abstract

The utility model relates to a high wind speed vertical fan, including fan head, drive assembly and telescopic vertical seat, fan head includes the high speed airflow circulation channel combinedly formed by front screen, enclosure and rear screen cover, and the unidirectional drive of fan blade is arranged in high speed airflow circulation channel to airflow, drive assembly includes horizontal swing motor and vertical swing motor, and horizontal swing motor and vertical swing motor jointly act on fan head, make fan head show eight character type swing head sweep wind, and drive assembly makes the airflow circulation direction of eight character type in high speed airflow circulation channel.

Description

Technical Field

[0001] This utility model relates to the technical field of fans, and in particular to a high-speed vertical fan. Background Technology

[0002] To meet consumers' diverse airflow requirements, existing electric fans are generally equipped with left-right and up-down oscillation mechanisms. There are two main types: one uses two motors to drive and control the fans, along with two sets of four-bar linkages, to achieve left-right and up-down oscillation; the other uses a single motor to control left-right oscillation, while up-down oscillation is manually adjusted via a positioning device.

[0003] Both of these methods involve horizontal reciprocating airflow on the same horizontal plane or vertical reciprocating airflow on the same vertical plane. Since the airflow range is limited, for small fan heads placed on a workbench, this limited range is insufficient for the user's functionality and cannot meet their actual needs. Similarly, for vertical fans, a limited airflow range also fails to meet the need for air delivery over a large area. Utility Model Content

[0004] In order to solve the above-mentioned problems in the prior art, this utility model provides a high-speed vertical fan.

[0005] The above-mentioned problems of this utility model are solved by the following technical solution:

[0006] A high-speed vertical fan includes a fan head, a drive assembly disposed on the back of the fan head, and a telescopic stand, wherein the telescopic stand is disposed below the drive assembly.

[0007] The fan head includes a high-speed airflow circulation channel formed by the combination of a front grille, a baffle and a rear grille. Fan blades are provided in the high-speed airflow circulation channel to drive the airflow in the high-speed airflow circulation channel in one direction.

[0008] The drive assembly includes a horizontal swing motor and a vertical swing motor. The horizontal swing motor and the vertical swing motor are used to drive the fan head to swing horizontally and vertically, respectively, and work together on the fan head to make the fan head swing in a figure-eight shape to sweep the air.

[0009] The drive component causes a figure-eight shaped airflow circulation direction to form in the high-speed airflow circulation channel.

[0010] A further feature of the above technical solution is that the enclosure is a ring structure and is detachably connected between the front net cover and the rear net cover.

[0011] A further feature of the above technical solution is that the rear mesh cover is a mesh structure formed by the radial combination of multiple metal strips, with an air inlet groove formed between two adjacent metal strips;

[0012] The front mesh cover is a plastic part, and an arc-shaped air outlet groove is formed on the end face;

[0013] The air intake area, composed of multiple air intake slots, covers the air outlet area, which is formed by multiple air outlet slots.

[0014] A further feature of the above technical solution is that the width of the air outlet trough widens from the center to both sides.

[0015] A further provision of the above technical solution is that: the inner wall of the enclosure is provided with mounting strips that are respectively connected to the front net cover and the rear net cover, the front end of the mounting strip along the axial direction is provided to form a front groove with the inner wall of the enclosure, and the rear end is formed with a rear groove.

[0016] A further feature of the above technical solution is that: the rear end of the mounting strip extends from the rear slot toward the rear mesh cover and has a guide portion, the guide surface on the guide portion and the insertion end of the rear slot are connected in an arc shape;

[0017] A stop is provided on the mounting strip on the other side of the rear slot. The stop wall of the stop is arranged vertically and is connected to the other end of the rear slot.

[0018] A further provision of the above technical solution is that the drive assembly also includes a swaying bracket fixed to the upper end of the telescopic stand, and a swinging bracket movably connected to the swaying bracket.

[0019] The horizontal swing motor is fixed on the oscillating bracket, and the first output shaft is set in the vertical direction, driving the oscillating bracket to oscillate in the horizontal range;

[0020] The vertical swing motor is fixed on the swing head bracket, and the second output shaft is set in the horizontal direction, driving the swing head bracket to swing up and down in the vertical range.

[0021] A further provision of the above technical solution is that a first eccentric block and a second eccentric block are respectively provided on the first output shaft and the second output shaft;

[0022] The first eccentric block is connected to the oscillating bracket via a first connecting rod; the second eccentric block is connected to the oscillating bracket via a second connecting rod.

[0023] A further provision of the above technical solution is that a rotary motor is provided on the oscillating head bracket, and the rotary motor passes through the rear mesh cover and is connected to the fan blade.

[0024] A further provision of the above technical solution is that the telescopic support includes a telescopic rod and a fixed base, the telescopic rod includes a sleeve rod fixed to the base and an inner rod telescopically disposed within the sleeve rod;

[0025] A stop groove is provided axially on the outer wall of the inner rod, and a stop member is hinged to the sleeve rod to lock with the stop groove.

[0026] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0027] 1. Through the combined action of the horizontal and vertical swing motors, the fan head is driven to swing in a figure-eight shape to sweep the air. Different swing speeds can be set to form a larger sweeping speed and range to meet the air supply needs of different occasions. At the same time, the high-speed airflow circulation channel formed by the fan head drives the airflow in one direction and outputs it from the front grille. Combined with the special air outlet structure, consumers can feel the high wind speed and large air volume.

[0028] 2. The rear mesh cover uses a radial structure of metal strips to form a large air inlet slot, while the front mesh cover is made of plastic to form a long diameter deep air outlet slot. The air inlet area covers the air outlet area, ensuring the stability and continuity of the air outlet; the detachable design of the enclosure facilitates installation and maintenance, and optimizes the structural design.

[0029] 3. The telescopic stand is locked to the inner rod stop groove of the telescopic rod and the sleeve rod stop, which can quickly adjust the height and automatically reset and lock, improving the flexibility of use. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of this utility model.

[0031] Figure 2 This is an exploded view of the fan head's mesh cover.

[0032] Figure 3 This is a schematic diagram of the fence structure.

[0033] Figure 4 for Figure 2 Enlarged structural diagram of part A in the middle.

[0034] Figure 5 This is a schematic diagram of the drive component.

[0035] Figure 6 This is an exploded structural diagram of the telescopic support.

[0036] Figure 7 This is a cross-sectional structural diagram of the telescopic rod in the locked state.

[0037] The attached diagram is labeled as follows: 100, Fan head; 110, Rear grille; 111, Air inlet slot; 120, Enclosure; 130, Front grille; 131, Air outlet slot; 132, Rib; 121, Locking buckle; 122, Locking part; 123, Mounting strip; 123.1, Front locking slot; 123.2, Rear locking slot; 123.3, Guide part; 123.4, Stop part;

[0038] 200, Drive assembly; 210, Horizontal swing motor; 220, Vertical swing motor; 230, Head-swing bracket; 231, Fixed shaft; 240, Head-swing bracket; 250, First connecting rod; 260, Second connecting rod; 270, First eccentric block; 280, Second eccentric block; 290, Rotary motor;

[0039] 300. Telescopic stand; 310. Base; 320. Telescopic rod; 321. Inner rod; 321.1. Gear slot; 322. Sleeve rod; 323. Stop; 324. Locking component; 324.1. Stop head; 324.2. Drive head;

[0040] 1. Buckle; 1.1. Hook; 2. Headband. Detailed Implementation

[0041] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0042] like Figure 1-7 As shown in the figure, this embodiment provides a high-speed vertical fan.

[0043] A high-speed vertical fan includes a fan head 100, a drive assembly 200 disposed on the back of the fan head 100, and a telescopic stand 300, wherein the telescopic stand 300 is disposed below the drive assembly 200.

[0044] The fan head 100 includes a high-speed airflow circulation channel formed by the combination of a front mesh cover 130, a baffle 120 and a rear mesh cover 110. Fan blades are provided in the high-speed airflow circulation channel to drive the airflow in the high-speed airflow circulation channel in one direction.

[0045] The drive assembly 200 includes a horizontal swing motor 210 and a vertical swing motor 220. The horizontal swing motor 210 and the vertical swing motor 220 are used to drive the fan head 100 to swing in the horizontal direction and in the vertical direction, respectively, and work together on the fan head 100 to make the fan head 100 swing in a figure-eight shape.

[0046] The drive component 200 causes a figure-eight shaped airflow circulation direction to be formed in the high-speed airflow circulation channel.

[0047] The above is the basic scheme of this embodiment.

[0048] Specific reference Figure 1 and Figure 2 As shown, the telescopic stand 300 includes a telescopic rod 320 and a base 310. The upper end of the telescopic rod 320 is connected to the drive assembly 200. The side of the drive assembly 200 is connected to the fan head 100, which drives the fan head 100 to rotate or swing.

[0049] The horizontal swing motor 210 drives the fan head 100 to swing and sweep in the horizontal range, and the vertical swing motor 220 drives the fan head 100 to swing and sweep in the vertical range. Compared with the conventional rotation sweeping in the prior art, the swing sweeping can give the fan head 100 a larger wind driving angle and driving range, thus achieving a better sweeping effect.

[0050] When the horizontal swing motor 210 and the vertical swing motor 220 work together on the fan head 100, the fan head 100 swings in a figure-eight shape. Different swing speeds can be set to achieve different sweeping speeds and sweeping ranges, thereby ensuring a wider sweeping range to meet different usage needs in different situations.

[0051] Meanwhile, to accommodate the high-volume airflow during sweeping, this embodiment features a specially structured fan head 100. The front grille 130, the enclosure 120, and the rear grille 110 combine to form a high-speed airflow circulation channel. During the sweeping process, the airflow passes through the high-speed airflow circulation channel and is output from the front grille 130, forming a high-speed airflow that is blown outwards, rapidly circulating the surrounding airflow and thus providing consumers with a high-volume, high-speed airflow experience.

[0052] Specifically, the enclosure 120 has a ring structure and is detachably connected between the front net cover 130 and the rear net cover 110.

[0053] To ensure consistent airflow direction in the high-speed airflow circulation channel and prevent airflow from being dispersed and reducing air volume, the enclosure 120 is set as a closed ring in this embodiment. Airflow cannot escape from the side, but can be output from the rear mesh cover 110 to the front mesh cover 130.

[0054] Specific reference Figure 3 As shown, in this embodiment, the enclosure 120 is formed by splicing two semicircular rings. One end of the semicircular ring is hinged, and the other end is provided with a buckle 121. The front net cover 130 and the rear net cover 110 are installed on one of the semicircular rings, and then the other semicircular ring is rotated to splice the two ends and fasten them with the buckle 121.

[0055] In this embodiment, the latch 121 is a latch plate 1 hinged to one of the semicircular rings. The latch plate 1 has a latch groove, and the other semicircular ring has a locking part 122 corresponding to the position of the latch groove, and the locking part 122 has a locking hole. By rotating the latch plate 1, the locking part 122 is inserted into the latch groove. The locking hole on the locking part 122 is located on the other side of the latch plate 1. Then, a short pin or other component is passed through the locking hole to limit the latch plate 1 between the short pin and the retaining wall 120, so that the latch plate 1 cannot be dislodged from the locking part 122, thereby realizing the locking function of the latch 121.

[0056] Furthermore, a hook 1.1 extends from the buckle plate 1 toward the fence 120. The fence 120 has a hook groove that can accommodate the hook 1.1. When the buckle plate 1 fastens the lock part 122, the hook 1.1 is inserted into the hook groove. In this way, when the short pin accidentally falls out of the lock hole, the hook 1.1 hooks the edge of the hook groove, which can temporarily keep the fence 120 in the spliced ​​state and prevent the fan head 100 from falling apart.

[0057] In this embodiment, the central axis of the short pin is parallel to the pivot of the buckle plate 1.

[0058] To ensure air outlet efficiency, in this embodiment, the rear mesh cover 110 is a mesh structure formed by the radial combination of multiple metal strips, and an air inlet groove 111 is formed between two adjacent metal strips;

[0059] The front mesh cover 130 is a plastic part, and an arc-shaped air outlet groove 131 is formed on the end face;

[0060] The air intake area, composed of multiple air intake slots 111, covers the air outlet area formed by multiple air outlet slots 131.

[0061] Specific reference Figure 2 As shown, the rear mesh cover 110 is formed by assembling metal strips in a radial pattern. Multiple radial metal strips are fixed in the circumferential direction, which can ensure the firmness and strength of the rear mesh cover 110, and at the same time form the largest possible air inlet slot 111, thereby maximizing the air intake volume.

[0062] By making the front grille 130 a plastic part, the diameter and depth of the air outlet slot 131 can be increased by setting the thickness of the front grille 130, so that the air outlet slot 131 forms a longer channel, thereby stabilizing the air outlet direction and forming directional air outlet.

[0063] In this embodiment, the size of the air intake area covers the air outlet area, meaning that the air intake volume can cover the air outlet volume, in order to ensure the stability and continuity of the airflow output from the air outlet area.

[0064] Preferably, in this embodiment, the width of the air outlet slot 131 is widened from the center to both sides.

[0065] Specific reference Figure 4 As shown, the air outlet slot 131 is configured with two symmetrical flared structures along the air outlet direction, and a flat rib 132 is formed between two adjacent air outlet slots 131. That is to say, when the airflow passes through the air outlet slot 131, because the first half of the air outlet slot 131 along the air outlet direction is a constricted structure, the airflow is compressed at this part, forming a high-speed airflow; while the second half is a flared structure, the airflow diffuses after passing through. Thus, the airflow output from the front mesh cover 130 forms a high-speed expanding airflow, allowing consumers to feel high wind speed and large air volume.

[0066] In this embodiment, the front grille 130, the enclosure 120, and the rear grille 110 of the fan head 100 are configured as detachable structures. The specific implementation method is as follows:

[0067] The inner wall of the enclosure 120 is provided with mounting strips 123 that are respectively connected to the front net cover 130 and the rear net cover 110. The front end of the mounting strip 123 along the axial direction forms a front groove 123.1 with the inner wall of the enclosure 120, and the rear end forms a rear groove 123.2.

[0068] Specific reference Figure 3 As shown, the mounting strip 123 is arranged along the axial direction of the enclosure 120 and is integrally formed with the inner wall of the enclosure 120. The front end of the enclosure 120 is configured as an annular ring with an inner diameter larger than that of the middle part. The annular ring and the front end of the mounting strip 123 form a front slot 123.1, and the front mesh cover 130 can be inserted into the front slot 123.1.

[0069] A rear retaining groove 123.2 is formed on the rear end face of the mounting strip 123. To match the circular cross-section of the metal strip, the rear retaining groove 123.2 is set as an arc-shaped groove.

[0070] Specifically, the rear end of the mounting strip 123 extends from the rear slot 123.2 toward the rear mesh cover 110 with a guide portion 123.3, and the guide surface on the guide portion 123.3 is arc-shapedly connected to the insertion end of the rear slot 123.2;

[0071] A stop portion 123.4 is provided on the other side of the rear slot 123.2 on the mounting strip 123. The stop wall of the stop portion 123.4 is arranged vertically and is connected to the other end of the rear slot 123.2.

[0072] During assembly, the rear mesh cover 110 slides along the guide surface on the guide portion 123.3 toward the rear slot 123.2 until it slides into the rear slot 123.2. The stop portion 123.4 at the front end of the rear slot 123.2 stops the rear mesh cover 110, preventing the rear mesh cover 110 from sliding out of the rear slot 123.2 during the sliding process.

[0073] In this embodiment, the stop portion 123.4 protrudes from the end face of the mounting strip 123.

[0074] In this embodiment, the drive assembly 200 further includes a swaying bracket 230 fixed to the upper end of the telescopic stand 300, and a swing bracket 240 movably connected to the swaying bracket 230.

[0075] The horizontal swing motor 210 is fixed on the oscillating bracket 230, and the first output shaft is set in the vertical direction, driving the oscillating bracket 230 to oscillate in the horizontal range;

[0076] The vertical swing motor 220 is fixed on the swing head bracket 240, and the second output shaft is set in the horizontal direction, driving the swing head bracket 240 to swing up and down in the vertical range.

[0077] Specific reference Figure 5 As shown, a fixed shaft 231 is provided at the bottom of the swaying bracket 230, and a swaying head sleeve 2 is hinged to the upper end of the telescopic stand 300, with the fixed shaft 231 connected to the swaying head sleeve 2.

[0078] A horizontally arranged first connecting rod 250 is provided on the first output shaft of the horizontal swing motor 210, and a movable sleeve is sleeved on the outside of the fixed shaft 231. The other end of the first connecting rod 250 is connected to the movable sleeve.

[0079] The second output shaft of the vertical swing motor 220 is connected to the oscillating bracket 230 via a second connecting rod 260.

[0080] Meanwhile, a first eccentric block 270 and a second eccentric block 280 are respectively provided on the first output shaft and the second output shaft;

[0081] The first eccentric block 270 eccentrically connects the first connecting rod 250 and the horizontal swing motor 210, and the second eccentric block 280 eccentrically connects the second connecting rod 260 and the vertical swing motor 220.

[0082] When the horizontal swing motor 210 is powered on and started, the first output shaft rotates, which drives the first connecting rod 250 through the first eccentric block 270, causing the connecting end of the first connecting rod 250 to rotate relative to the first output shaft, while the end of the first connecting rod 250 connected to the movable sleeve swings relative to the first output shaft.

[0083] Since the movable sleeve is fixed relative to the oscillating sleeve 2 and the telescopic stand 300 in the horizontal range, the horizontal oscillation motor 210 oscillates relative to the telescopic stand 300, thereby driving the oscillating bracket 230 to oscillate, so as to drive the fan head 100 to oscillate in the horizontal range.

[0084] Similarly, when the vertical swing motor 220 starts, due to the action of the second eccentric block 280 and the second connecting rod 260, the swing head bracket 240 and the swaying bracket 230 will swing relative to each other in the vertical range. However, due to the action of the fixed shaft 231, the swaying bracket 230 cannot move in the vertical range. Therefore, the vertical swing motor 220 drives the swing head bracket 240 to swing up and down in the vertical range.

[0085] Furthermore, in this embodiment, a rotary motor 290 is provided on the oscillating head bracket 240, and the rotary motor 290 passes through the rear mesh cover 110 and is connected to the fan blade.

[0086] Specific reference Figure 5 As shown, the rotary motor 290 is fixed on the oscillating head bracket 240. When the oscillating head bracket 240 oscillates in the vertical range, it drives the fan head 100 to oscillate. The oscillating head bracket 240 is installed on the oscillating head bracket 230. When the oscillating head bracket 230 oscillates in the horizontal range, it drives the oscillating head bracket 240 and the fan head 100 to oscillate together.

[0087] The telescopic support 300 includes a telescopic rod 320 and a fixed base 310. The telescopic rod 320 includes a sleeve rod 322 fixed on the base 310 and an inner rod 321 telescopically disposed within the sleeve rod 322.

[0088] The inner rod 321 has a stop groove 321.1 axially provided on the outer wall of the inner rod 321, and the sleeve rod 322 is hinged with a stop 323 to lock with the stop groove 321.1.

[0089] Specific reference Figure 6 and Figure 7 As shown, the gear slots 321.1 are arranged axially on the outer wall of the inner rod 321, and the inner rod 321 is inserted into the sleeve rod 322; at the same time, the stop member 323 is provided on the sleeve rod 322, and the stop head 324.1 on the stop member 323 extends into the sleeve rod 322 and is engaged in the gear slots 321.1 of the inner rod 321, so as to lock the inner rod 321 and the sleeve rod 322.

[0090] Reference Figure 7 As shown, a locking member 324 is hinged to the stop member 323. The locking member 324 includes a stop head 324.1 and a drive head 324.2 located on both sides of the hinge end. The drive head 324.2 extends out of the sleeve rod 322 for the user to operate.

[0091] When the user presses the drive head 324.2, the drive head 324.2 drives the locking member 324 to rotate, causing the stop head 324.1 to rotate synchronously, thereby rotating out of the gear slot 321.1 and unlocking the inner rod 321 and the sleeve rod 322.

[0092] In order to enable the locking member 324 to automatically reset and lock the telescopic rod 320, an elastic member can be provided between the drive head 324.2 and the stop member 323. The elastic member causes the drive head 324.2 to rotate outward. When the external force is removed, the drive head 324.2 automatically rotates out, thereby driving the stop head 324.1 to rotate in and lock into the gear slot 321.1 to automatically lock the telescopic rod 320.

[0093] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A high-speed vertical fan, comprising a fan head (100), a drive assembly (200) disposed on the back of the fan head (100), and a telescopic stand (300), wherein the telescopic stand (300) is disposed below the drive assembly (200); Its features are: The fan head (100) includes a high-speed airflow circulation channel formed by the combination of a front grille (130), a baffle (120) and a rear grille (110), and fan blades are provided in the high-speed airflow circulation channel to drive the airflow in the high-speed airflow circulation channel in one direction. The drive assembly (200) includes a horizontal swing motor (210) and a vertical swing motor (220). The horizontal swing motor (210) and the vertical swing motor (220) are used to drive the fan head (100) to swing horizontally and vertically, respectively, and work together on the fan head (100) to make the fan head (100) swing in a figure-eight shape. The drive assembly (200) causes a figure-eight airflow circulation direction to be formed in the high-speed airflow circulation channel.

2. The high-speed vertical fan according to claim 1, characterized in that: The enclosure (120) has a ring structure and is detachably connected between the front net cover (130) and the rear net cover (110).

3. The high-speed vertical fan according to claim 1 or 2, characterized in that: The rear mesh cover (110) is a mesh structure formed by the radial combination of multiple metal strips, and an air inlet groove (111) is formed between two adjacent metal strips; The front mesh cover (130) is a plastic part, and an arc-shaped air outlet groove (131) is formed on the end face; The air inlet area, composed of multiple air inlet slots (111), covers the air outlet area formed by multiple air outlet slots (131).

4. The high-speed vertical fan according to claim 3, characterized in that: The width of the air outlet groove (131) flares out from the center to both sides.

5. The high-speed vertical fan according to claim 1, characterized in that: The inner wall of the enclosure (120) is provided with mounting strips (123) that are respectively connected to the front net cover (130) and the rear net cover (110). The front end of the mounting strip (123) along the axial direction is provided to form a front groove (123.1) between it and the inner wall of the enclosure (120), and the rear end is formed with a rear groove (123.2).

6. The high-speed vertical fan according to claim 5, characterized in that: The rear end of the mounting strip (123) extends from the rear slot (123.2) toward the rear mesh cover (110) with a guide portion (123.3), and the guide surface on the guide portion (123.3) and the insertion end of the rear slot (123.2) are connected in an arc shape. A stop (123.4) is provided on the other side of the rear slot (123.2) on the mounting strip (123). The stop wall of the stop (123.4) is arranged vertically and is connected to the other end of the rear slot (123.2).

7. The high-speed vertical fan according to claim 1, characterized in that: The drive assembly (200) also includes a swaying bracket (230) fixed to the upper end of the telescopic stand (300), and a swing bracket (240) movably connected to the swaying bracket (230); The horizontal swing motor (210) is fixed on the sway bracket (230), and the first output shaft is set in the vertical direction, driving the sway bracket (230) to sway in the horizontal range; The vertical swing motor (220) is fixed on the swing head bracket (240), and the second output shaft is set in the horizontal direction, driving the swing head bracket (240) to swing up and down in the vertical range.

8. The high-speed vertical fan according to claim 7, characterized in that: The first output shaft and the second output shaft are respectively provided with a first eccentric block (270) and a second eccentric block (280); The first eccentric block (270) is connected to the head-swing bracket (230) via the first link (250); the second eccentric block (280) is connected to the head-swing bracket (240) via the second link (260).

9. The high-speed vertical fan according to claim 7, characterized in that: A rotary motor (290) is provided on the swing head bracket (240), and the rotary motor (290) passes through the rear mesh cover (110) and is connected to the fan blade.

10. The high-speed vertical fan according to claim 1, characterized in that: The telescopic support (300) includes a telescopic rod (320) and a fixed base (310). The telescopic rod (320) includes a sleeve rod (322) fixed on the base (310) and an inner rod (321) telescopically disposed within the sleeve rod (322). The inner rod (321) has a stop groove (321.1) axially provided on the outer wall of the inner rod (321), and a stop (323) is hinged on the sleeve rod (322) to lock the stop groove (321.1).

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